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Is there a way to charge HV battery

Discussion in 'Gen II Prius Technical Discussion' started by DOLPHINS FAN, May 14, 2009.

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  1. DOLPHINS FAN

    DOLPHINS FAN New Member

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    Working on a wrecked 2006 prius and need to charge battery.
  2. efusco

    efusco Troll Slayer Staff Member

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    Yes, but not easily. If someone doesn't chime in here with the technical details you need you might wanna check out the Yahoo! prius tech forum: Prius_Technical_Stuff : To discuss the unique interface and poss

    Hope you have some pretty high level electronics knowledge and equipment if you plan to take this on. Also, depending upon how deeply discharged the battery is and how long its been that way you may be better off finding a recent salvage battery that still has charge and using it instead. The battery you have may be shot or at least not have anywhere near it's normal useful capacity.
  3. TonyPSchaefer

    TonyPSchaefer Your Friendly Moderator Staff Member

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  4. FL_Prius_Driver

    FL_Prius_Driver Senior Member

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  5. bwilson4web

    bwilson4web 03 and 10 Prius

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    There are four options:
    1. Toyota charger - get the car to the local Toyota service center and ask them to get one of the few floating Toyota traction battery chargers and charge it up. Advantage: OEM recommended practice. Disadvantage: no survey for weak modules; expense.
    2. Bench charge all modules - put the traction battery on a bench, remove the cover, jumper the safety relay, and use a 202-210 VDC, constant current charger on the end terminals. Advantage: all modules get the same charge. Disadvantage: no survey for weak modules.
    3. Bench charge banks - same as above but runs the variable voltage, constant current to charge each set. Advantage: lower voltages. Disadvantage: no survey for weak modules; risk of one bank being more charged than the other.
    4. Bench charge modules - put the battery on a bench, remove the buss bars, and charge/discharge each module using a smart, RC charger. Advantage: health of each module is tested and left in a known charge state. Disadvantage: takes longer, smart charger cost $150, self-discharge makes module balancing tricky.
    Charging NiMH batteries is quite a bit different from lead-acid batteries. You really need a sensitive temperature cut-off to avoid destructive over charging but done right, it also detect the dV/dt change that signals end of charge. It can be done but it is different.

    You may want to visit "Prius Technical Stuff" for more details from those who have dealt with NHW20 batteries. I've just had NHW11 traction batteries and they are different.

    GOOD LUCK!
    Bob Wilson
    1 person likes this.
  6. statultra

    statultra uber-Senior Member

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    u shoudnt need to charge it unless its been sitting for like 2 years in snow and rain and ice and horrible conditions like mine has been, its not like the battery is completely dead, upon connecting the 12 volt battery it seems the battery ECU takes some time to "get used" to the SOC so my guess is you can start it within 5-10 seconds of connecting 12 volt battery even if SOC is less than 40 %

    also, you can check SOC by connecting 12 volt battery and putting ig-on to see how many bars on the HV battery
  7. priusireland

    priusireland New Member

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    Hi Bob,

    I have a 2001 NHW11 Prius and I need to charge the HV Battery. I was thinking about just (3.) bench charging the banks, but I want a charger that can also (4.) bench charge modules if needed. Can you recommend a good charger that can do both? Thanks in advance.

    Prius Ireland
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  8. jelloslug

    jelloslug It buffed right out!

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    Unless you know for a fact the battery is too low to start the car just disconnect it with the service plug and don't worry about it. On the ol' salvage car I let it sit for almost two months disconnected and it did not change the SOC at all that I could tell. I did, however, have to charge the little 12V battery several times.....
  9. priusireland

    priusireland New Member

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    Hi jelloslug,

    The Prius I am working on is a japanese import, when it arrived in Ireland the HV battery was so low the car would'nt start. It was lying up for several months. I tested the battery and it is definitely to low to start the car. I already have the HV battery out of the car and I am looking for the easiest way to charge it. Would you be able to recommend a charger that can charge the two banks of modules and can also charge the seperate modules?

    Prius Ireland
  10. jelloslug

    jelloslug It buffed right out!

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    I cannot recommend a specific charger but if I were to charge a dead pack I would charge the cells individually so I could check their health before I reassembled the battery pack.
  11. hobbit

    hobbit Senior Member

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    Take whatever generic high-ish voltage power supply you have,
    figure out how many modules' worth is just under its output
    voltage under load, and charge the pack in pieces. Assuming
    there's nothing bad along the string, of course. Use a dropping
    resistor to limit current and MONITOR current and voltage really
    closely. Quit below 8.2 V per module. Once you get it to start
    the car, provided everything else is working right, the car
    should take over pack management reasonably well although a little
    manual balancing might still be needed later.
    .
    You've got 240V power there, right? A simple half-doubler using
    a couple of rectifiers ad a cap would give you a simple low-current
    power supply that could do the whole pack [albeit slowly].
    .
    _H*
  12. priusireland

    priusireland New Member

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    After a bit more research I have decided to buy the MRC Super Brain 989. Does anyone have a step by step (idiots) guide with photos if possible on how to charge the HV battery one bank at a time? I have decided to do it this way to get the car up and running as quickly as possible, if it is still giving trouble when I have done this I will take it apart again and charge each module individually.
  13. statultra

    statultra uber-Senior Member

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    did the op mention that this is a NHW10 prius? If it is i think theres a charger built in the trunk for the HV battery.
  14. andyprius

    andyprius Senior Member

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    Looks like the OP checked out.
  15. Fester

    Fester Junior Member

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    If a used pack, make sure that each cell hasn't dropped below 1.0v if you can. Nickel Metals will typically self-discharge at a 25-30% per month, so something that has been shelved and not maintained needs a careful checkout.
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